Abstract: A tamper indicating bag is formed by cutting a perforation along a sheet which is subsequently folded over and sealed along two sides and the top edge. The fold is made so that one of the walls of the bag is longer than the other and the heat seal is applied above the perforation which in turn forms a flap in the wider sheet. Printing is applied to the flap as well as above and below the perforation and a tamper indicating adhesive is then applied to the flap. The bag can be opened by separating the perforated opening and contents placed in the bag. The flap is then folded over the opening sealing it and providing a tamper indicating seal.